Hairy situation

I'm 15 and so hairy it's unreal, I have to shave my under arms every other day as they grow so quickly. I have a moustache that's pretty noticible if I don't pluck or shave it with an epilator, my stomach and between and on my boobs is pretty bad too so I have to shave my stomach and my back as what I can see isn't great either. The hair on my thighs is just ridiculous, however I can cope for now until shorts season comes in (hot summer)! I'm also getting hair on my fingers and toes which I have to shave!!
What could be causing this and what can I do/take to stop, prevent or slow this all down? Because I find it so embarrassing and it makes me really self concious.